A chemical catalyst is a substance that lowers the required activation energy of a reaction. The activation energy is the amount of energy required to activate or start a pr â¦ ocess, this can be in the form of many things, such as heat. catalyst accelerates the process of a chemical reaction. If a reaction is a slow one then by introducing a catalyst would speeden up the process. For example :- The reaction â¦ between hydrogen and nitrogen to create ammonia is a slow reaction. Finely divided iron act as a catalyst.
For other uses, see Boatswain (disambiguation). A boatswain (/ËboÊsÉn/, formerly and dialectally also /ËboÊtsweÉªn/), bo's'n, bos'n, or bosun, also known as a Petty Officer or a qualified member of the deck department, is the seniormost rate of the deck department and is responsible for the components of a ship's hull.
US Military Careers. The Navy's Boatswain's Mate rating (which is what the Navy calls its jobs) is one of the two oldest in this branch of the military, dating back to 1794. This rating, which has Navy Occupational Specialty code number B400 allows new recruits to enlist without a specific career path identified.